Balance Sheet Details (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of intangible assets
Gross Carrying Value	$ 4,317	$ 4,317
Accumulated Amortization	(3,999)	(3,948)
Net Carrying Value	318	369
Patents
Schedule of intangible assets
Gross Carrying Value	2,476	2,476
Accumulated Amortization	(2,158)	(2,107)
Net Carrying Value	318	369
Developed core technology
Schedule of intangible assets
Gross Carrying Value	1,100	1,100
Accumulated Amortization	(1,100)	(1,100)
Net Carrying Value	0	0
Patent license agreement
Schedule of intangible assets
Gross Carrying Value	741	741
Accumulated Amortization	(741)	(741)
Net Carrying Value	$ 0	$ 0